Par 40 meter EFHW antenna disected. Sorry for the camera movement I did this at 0230 hours. If you pause the video for a minute your sea sickness will dissipate.
Great video! It's obvious that you put a lot of research and effort into the presentation. I first got a Par 20m. Later, I got Larry Draughon's 10m/20m/40m Mark II QRP and later a 40m/20m after he (LnR Precision) bought the rights from Dale Parfitt (not Par). They are very good. I figured they were simple, but wow... However, the great majority of hams lack a technical electrical understanding and test equipment. It is nice to have someone take the time to explain things. They are a bit pricey to buy if you base it on components only. As a medical specialist once told me, "you're paying me for what I know how to do; not what I did". I've used them with 50 and 25 feet of RG-8X and also RG-58. I also have Dale's OA-50 6m antenna. It's a solid performer.
In reference to Kevin's comment, I wasn't aware that it needed 25 feet of coax either. I started off with 50 feet of RG-8X for vacation portable. I went to 50 feet of RG-158 center-stranded coax, and then down to 25 feet, as it is smaller to wind up and a bit lighter. I noticed my SWR went up a bit, but I had one of those stands that fits underneath my tire, and the mast goes in. I figured it was my SUV's metal roof (probably was). I do agree that those Par's are awesome! As much as I love their performance, experimenting as a ham is fun. I'm trying something for QRP. I got an End Fed Half Wavelength QRP tuner kit from the QRP Guys. I'm going to build it and then use .26 Silky wire from The Wireman. I'm not going to stop using my Par antennas, but I'm trying to see how light of a kit I can make... For anything over 10 watts, the Pars will come out (or if I just don't want to mess with adjusting it).
I tore apart an 80M EFHW from PAR / LNR Precision..... 52 turns and 25-3/4" of RG316 (last 1/2" was stripped/tinned). It's nuts how simple these things are and how well they work.
Impedance or inductance. I think you swapped these words a few times in the video? I wasn't aware of the requirement for 25' of feedline. I ran the EFHW-40/20 for FD last year and in my yard often with about 5' in between with OK (actually better than OK) performance. I didn't see any requirement for a counterpoise but I definitely have to try the longer feedline. As a 1/2 wave antenna, is a counterpose effective? Nice work on the video! It's not quite what I had expected inside. 73 de K4VD
Hi Ed: Do you or any one reading the comments have the measurements (inductance and capacitance if possible) for the coil and coax stub in the 10/20/40M model? I am trying to make a similar one, but very light for portable use...
If you like playing with antennas here is a video from Steve Ellington notice the Myantennas 8010 transformer. ruclips.net/video/xfqlun3bdI0/видео.html This is the diagram for it pa-11019.blogspot.com/2012/04/149-transformer-for-endfed-antennas-35.html
So you just reverse engineered the gentleman's product on youtube thereby limiting his sales potential by whatever number of antennas he is now not going to be able to sell. Well done. May the same thing be visited upon you if you are ever competent enough to design something for the market place... *GAWD* Talk about HAMS helping each other out...
Most hams would not be comfortable making this antenna, regardless if you would. Plus, it's an attractive antenna. I've read where people have bunches of them. Granted, that is a bit excessive.
4 года назад
Hey. Please hold it back. What they are selling its an old design, not designed by them. And ham radio diy its a great way to learn... Search for EFHW antenna and you will find.
+Mike R I believe it was approximately 42pF, I did not check it with all 3 LC/Cap meters only one. I am not sure if it varies when coiled in the box and if when transmitting, the magnetic field around the Toroid effects it at all. maybe someone with more knowledge could elaborate on that. Around 42pF. Thanks for asking Mike.
Great video! It's obvious that you put a lot of research and effort into the presentation. I first got a Par 20m. Later, I got Larry Draughon's 10m/20m/40m Mark II QRP and later a 40m/20m after he (LnR Precision) bought the rights from Dale Parfitt (not Par). They are very good. I figured they were simple, but wow... However, the great majority of hams lack a technical electrical understanding and test equipment. It is nice to have someone take the time to explain things. They are a bit pricey to buy if you base it on components only. As a medical specialist once told me, "you're paying me for what I know how to do; not what I did". I've used them with 50 and 25 feet of RG-8X and also RG-58. I also have Dale's OA-50 6m antenna. It's a solid performer.
Yep, they work very well
Your the man Eduard. Just what I was looking for!!! I'm building one!
I also built one after dissecting this and works great.
In reference to Kevin's comment, I wasn't aware that it needed 25 feet of coax either. I started off with 50 feet of RG-8X for vacation portable. I went to 50 feet of RG-158 center-stranded coax, and then down to 25 feet, as it is smaller to wind up and a bit lighter. I noticed my SWR went up a bit, but I had one of those stands that fits underneath my tire, and the mast goes in. I figured it was my SUV's metal roof (probably was). I do agree that those Par's are awesome! As much as I love their performance, experimenting as a ham is fun. I'm trying something for QRP. I got an End Fed Half Wavelength QRP tuner kit from the QRP Guys. I'm going to build it and then use .26 Silky wire from The Wireman. I'm not going to stop using my Par antennas, but I'm trying to see how light of a kit I can make... For anything over 10 watts, the Pars will come out (or if I just don't want to mess with adjusting it).
I tore apart an 80M EFHW from PAR / LNR Precision..... 52 turns and 25-3/4" of RG316 (last 1/2" was stripped/tinned). It's nuts how simple these things are and how well they work.
The Myantennas 1080 is easy to make. I made one and it works great. I purchased one first and than looked online and made my own.
@@EddieVfgi Hi Edward, have you got the link on how to make the 1080, i would like to see that 73 G1YYU
@@batwillow check out Steve Ellington on YT
Thank you!
RG 316 and RG 141 both are supposed to be 29.4 pF per foot so 42 to 45 pF sounds close. RG 141 is actually specked as a higher breakdown..
and RG-58(ab/u) are each about 29 pF per footr as well ... one could use that.
Impedance or inductance. I think you swapped these words a few times in the video? I wasn't aware of the requirement for 25' of feedline. I ran the EFHW-40/20 for FD last year and in my yard often with about 5' in between with OK (actually better than OK) performance. I didn't see any requirement for a counterpoise but I definitely have to try the longer feedline. As a 1/2 wave antenna, is a counterpose effective? Nice work on the video! It's not quite what I had expected inside. 73 de K4VD
Thanks for the info. Could you divide the turns by two and cut the RG 316 in half and have a 20 meter transformer? Thanks K7WHN
Hi Ed:
Do you or any one reading the comments have the measurements (inductance and capacitance if possible) for the coil and coax stub in the 10/20/40M model? I am trying to make a similar one, but very light for portable use...
Great Video thanks!
If you like playing with antennas here is a video from Steve Ellington
notice the Myantennas 8010 transformer. ruclips.net/video/xfqlun3bdI0/видео.html
This is the diagram for it pa-11019.blogspot.com/2012/04/149-transformer-for-endfed-antennas-35.html
Instead of using the 18-1/4 coax could you just use a two parallel 22 pF caps? Thanks for the great explanation!
Don't know, give it a try.
Great video! However, it's Dale Parfitt, not Par. That's just the abbreviation he uses in the title of the antenna.
what size is that box
So you just reverse engineered the gentleman's product on youtube thereby limiting his sales potential by whatever number of antennas he is now not going to be able to sell. Well done. May the same thing be visited upon you if you are ever competent enough to design something for the market place... *GAWD* Talk about HAMS helping each other out...
Most hams would not be comfortable making this antenna, regardless if you would. Plus, it's an attractive antenna. I've read where people have bunches of them. Granted, that is a bit excessive.
Hey. Please hold it back. What they are selling its an old design, not designed by them. And ham radio diy its a great way to learn... Search for EFHW antenna and you will find.
Really good video. What toroid would I use if I wanted to build a qrp version of this?
same toroid no different, it works up to 125 watts
What capacitance does that RG316 measure? de WE0H
+Mike R I believe it was approximately 42pF, I did not check it with all 3 LC/Cap meters only one.
I am not sure if it varies when coiled in the box and if when transmitting, the magnetic field around the
Toroid effects it at all. maybe someone with more knowledge could elaborate on that.
Around 42pF.
Thanks for asking Mike.
+Edward Vignati Excellent thank you. de WE0H ..
What is the ratio of the transformer?
I just dissected it, counted turns and used meter readings.